Drill mounting



A ril 17, 1934.

gm llnvllllmlll ll llllll ,W. A. SMITH, SR

DRILL MOUNTING Filed Dec. 8, 1932 JNVENTOR. I Yzl ct/22551211612 50.

H15 ATTORNEY.

Patented Apr, 17, 1934 earn or ies lngersoll-iRand Company, Ecrsey City,FL I, a

corporation of New Jersey Application December d,

1332, Serial No. (546,233

4 Claims. (Cl, 255-53) This invention relates to rock drillingmechanisms, and more particularly to a drill mountin adapted to beinterposed between the roof and floor of a mine drift for supporting apercussive tool.

One object of the invention is to enable the mounting to be quickly setin a desired position.

Another object is to enable the mounting to be expeditiously moved fromone drilling site to another.

Another object is to retain the mounting fixedly between the surfaceswhereby it is supported irrespective of the nature of the soil uponwhich it rests.

Other objects will be in part obvious and in part pointed outhereinafter.

In the drawing accompanying this specification and in which similarreference characters refer to similar parts,

Figure l is an elevation insection of a mcunting constructed inaccordance with the practice of the invention and having a fluidactuated drilling mechanism mounted thereon, the latter being shownpartly broken away, and

Figure 2 is a plan view of the mounting taken through Figure 1 on theline 2-2 looking in the direction indicated by the arrows.

Referring more particularly to the drawing, A designates a rock drilland B the mounting whereby the rock drill A is supported. The rock drillA may, as illustrated, consist of a drilling motor 0 adapted to actuatea working imple inent D into the material E. The drilling motor is fedto the work by a feeding mechanism F comprising a feeding cylinder G anda feeding piston l-l therein having a rod J which is connected to therear end of the drilling motor C.

The feeding piston H is of the differential type having opposedactuating surfaces of which the larger surface, designated K, is locatedon the rear end of the piston HI and may, during the normal operation ofthe drilling mechanism, be constantly exposed to pressure fluid suppliedthereto by a passage L in a head 0 which forms a closure for the rearend of the feeding cylinder Gr. The head 0, moreover, serves as ahousing for a throttle valve P whereby communication between the passageL and a supply passage Q in the head 0 may be controlled.

The piston H is shown as having a passage R; which may also extendthrough the rod J for supplying pressure fluid to the drilling motor C.The front pressure area S of the piston H is also constantly exposed topressure fluid which is admitted into the cylinder G, forwardly of thethe rod X is threaded a rock engaging pointer piston H, through apassage T in the cylinder G.

The mounting B, constructed in accordance with the practice of theinvention, is of the ver tical type and comprises in the presentinstance a cylinder U having a piston chamber V for the accommodation ofa piston W. The piston W carries a rod X which extends slidably througha guide bushing Y threaded into the outer end of the cylinder U. Intothe outer or free'end of Z to engage the roof of a drift wherein thedrilling mechanism is arranged.

On the exterior surface of the cylinder U is a saddle member b which maybe clamped to the feeding cylinder G and to the cylinder U, in a wellknown manner, at any point along the length of the cylinder U.

A closure is provided for the lower end of the cylinder U by a head 0into which the cylinder U extends and towhich it may be secured, as byraising or otherwise. The head 0 is preferably of considerably largerdiameter than the cylinder U and is recessed to provide a supplyreservoir or chamber d which, in this instance, encircles the cylinder Uand communicates with the piston chamber V through a port e in thecylinder U.

Within the head 0 is a supply passage f and into the outer end of thepassage is threaded a connection 9 which may lead from a source ofpressure fluid supply. Communication between the supply passage f andthe connection 9 is controlled by a throttle valve h in the head 0 andthe said throttle valve may also control communication between thepassage f and an exhaust port 7' in the head 0.

To the end that pressure fluid may be conveniently supplied to thefeeding cylinder G, for actuating the piston H and the elementsconnect-= ed thereto, the head 0 is provided with a pair of outlet ports76 and o to which are connected flexible conduits p and (1,respectively. The conduit p is connected, at its opposite end, to thepassage T and the conduit q leads to the passage Q to supply pressurefluid to the ends of the feeding cylinder G.

In order to provide the mounting with suitable supporting devices aplurality of radially extending rods 1*, three being shown herein, arearranged fixedly in the head 0 and preferably disposed equi-angularlywith respect to each other. The outer ends of the rods r carry plates 3having hub portions t which are recessed to receive the outer ends ofrods 1* which may be pressed fitted to the hub portions t or otherwisefixedly secured thereto. As a preferred form of construction the uthereof are preferably of convex or similar shape of which the outerportions incline toward the edges of the plates. The plates s are,moreover, of substantial diameter in order that they may present a widesurface or areaof contact to the material upon which the mounting rests.

In practice, and with the drilling mechanism and the mounting arrangedin substantially the correct position with respect to the floor and roofof a drift, the valve h is positioned to communicate the supplyconnection 9 with the supply chamber d. The pressure fluid thus admittedinto the supply chamber flows'through the port 2 into the piston chamberU and, by acting against the piston W, presses the pointer Z firmlyagainst the roof of the drift. The pressure passage 1 with the exhaustport 7'.

thus acting against the piston and the head 0 forces the plates s firmlyagainst the floor upon which they seat and will maintain the entiremounting immovable and unaffected by the vibrations incident to theoperation of the drilling motor 0.

Whenever it is desired to shift the drilling mechanism the valve It maybe rotated to blank off the connection a and to communicate the Pressurefluid will then be exhausted from the piston chamber V and the piston Wwill descend and move the pointer Z out' of contact from the roof. The

mounting, together with the: drilling mechanism,

may then be skidded along the floor of the drift conveniently supportedupon soft or broken material without requiring frequent resetting of themounting to maintain it in the correct position. Being of large area,the plates s will prevent the mounting from sinking into the material,and the position of the mounting will, therefore, remain undisturbedthroughout the entire drilling operation.

the tool, a piston in the cylinder having a rod,

arock engaging pointer at the end of the rod, means for supplyingpressure fluid to the cylinder to actuate the piston, and a plurality ofdishshaped base members secured rigidly to the cylinder and beingoff-set with respect thereto to support the mounting.

3. A mounting for supporting a fluid actuated percussive tool,comprising a cylinder to support the tool, a piston in the cylindercarrying a rock engaging pointer, a head for the cylinder, means in thehead for supplying pressure fluid to the cylinder for actuating thepiston, a plurality of rods secured fixedly to the head and extendingradially thereof, and dish-shaped base members secured fixedly to theouter ends of the rods to support the mounting.

4. A mounting for supporting a fluid actuated percussive tool,comprising a cylinder to support the tool, a piston in the cylindercarrying a rock engaging pointer, a head for the cylinder and having apressure fluid supply chamber communicating with the cylinder, said headhaving an outlet opening for supplying pressure fluid from the chamberto a tool supported by the mounting, a throttle valve in the head forcontrolling the admission of pressure fluid into the cylinder, aplurality of radially extending arms secured fixedly to the cylinder,and dish-shaped base members secured rigidly to the arms for supportingthe mounting.

WILLIAM A. SMITH, SR.

